var fs = require('fs');
var path=require('path');
var  subDir =process.argv[2];
var filter =process.argv[3];
fs.readdir(subDir, function(err, list){
if(err){
    console.log(err);
}else{
    console.log(list);
    for(var item of list){
        if(path.extname(item) === '.'+filter){
            console.log(item);
        }
    }
}
});
